... :GB/T3094-2000, GB/T6728-2002, ASTM A500, JIS G 3466, DIN EN 10210, GB/T178-20052. MATERIAL:Q195, ... Treatment.4. TECHINQUE:Hot rolled, Cold rolled, ERW, High-frequency welded.5. APPLICATION:(1).Machinery manufacture: glass machinery, ... .We have passed the standards of ASTM A500, JIS G 3466, DIN EN10210, GB/T178-2005, GB/T ... Perfect after-sale service to solve your worries. High Quality Square steel pipe